After years of working with troubled individuals claiming to have been abducted by extraterrestrials, Harvard University Professor John Mack published a book. What made Mack and the book so controversial was the fact that he had come to accept that his patients’ stories were an accurate description of real events.

In the history of psychiatry, the First World War is often identified with the rise of the disorder of “shellshock.” However, many in both the medical community and the military establishment were dubious of the claim that war could produce psychiatric symptoms.